Male ruby-throated hummingbirds tend to migrate north about a week ahead of the females. How do males benefit by arriving before females? How do females benefit? Think... then link!
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Males |
Females |
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| Ruby-throated Hummingbird |  |
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| Rufous Hummingbird |
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Photos (clockwise from top left): Russ Thompson, Ed Robertson, Ed Robertson,
Ed Robertson
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